Deprecate and remove usage of hipposys:types as sub node of hipposys:workflow

With the removal of JDO, hipposys:types no longer is needed nor used.
Currently this is defined as a mandatory and autocreated child node of hipposys:workflow:
+ hipposys:types (hipposys:types) = hipposys:types mandatory autocreated

This can simply be made optional and no longer autocreated (compatible changes), with.:
+ hipposys:types (hipposys:types) = hipposys:types

Furthermore, specific configuration of these child nodes can be removed from all workflow configurations.
Within the WorkflowManagerImpl and WorkflowInvocationHandler class the usages (referencing HippoNodeType.HIPPO_TYPES) can be removed.